diff --git a/src/host/iot_host.erl b/src/host/iot_host.erl
index e7a5d14..8f5f025 100644
--- a/src/host/iot_host.erl
+++ b/src/host/iot_host.erl
@@ -266,24 +266,26 @@ handle_event({call, From}, {activate, false}, _, State = #state{uuid = UUID, cha
     {next_state, ?STATE_DENIED, State#state{channel_pid = undefined, has_session = false}, [{reply, From, ok}]};
 
 %% 绑定channel
-handle_event({call, From}, {attach_channel, ChannelPid}, StateName, State = #state{uuid = UUID, channel_pid = undefined}) ->
-    case StateName of
-        ?STATE_ACTIVATED ->
-            erlang:monitor(process, ChannelPid),
-            %% 更新主机为在线状态
-            ChangeResult = iot_api_client:change_host_status(UUID, ?HOST_ONLINE),
-            logger:debug("[iot_host] host_id(attach_channel) uuid: ~p, will change status, result: ~p", [UUID, ChangeResult]),
-            {keep_state, State#state{channel_pid = ChannelPid, has_session = true}, [{reply, From, ok}]};
-        %% 主机未激活
-        ?STATE_DENIED ->
-            logger:notice("[iot_host] attach_channel host_id uuid: ~p, channel: ~p, host inactivated", [UUID, ChannelPid]),
-            erlang:monitor(process, ChannelPid),
-            {keep_state, State#state{channel_pid = ChannelPid}, [{reply, From, {denied, <<"host inactivated">>}}]}
+handle_event({call, From}, {attach_channel, ChannelPid}, StateName, State = #state{uuid = UUID, channel_pid = OldChannelPid}) ->
+    case OldChannelPid == undefined orelse OldChannelPid =:= ChannelPid of
+        true ->
+            case StateName of
+                ?STATE_ACTIVATED ->
+                    erlang:monitor(process, ChannelPid),
+                    %% 更新主机为在线状态
+                    ChangeResult = iot_api_client:change_host_status(UUID, ?HOST_ONLINE),
+                    logger:debug("[iot_host] host_id(attach_channel) uuid: ~p, will change status, result: ~p", [UUID, ChangeResult]),
+                    {keep_state, State#state{channel_pid = ChannelPid, has_session = true}, [{reply, From, ok}]};
+                %% 主机未激活
+                ?STATE_DENIED ->
+                    logger:notice("[iot_host] attach_channel host_id uuid: ~p, channel: ~p, host inactivated", [UUID, ChannelPid]),
+                    erlang:monitor(process, ChannelPid),
+                    {keep_state, State#state{channel_pid = ChannelPid}, [{reply, From, {denied, <<"host inactivated">>}}]}
+            end;
+        false ->
+            logger:notice("[iot_host] attach_channel host_id uuid: ~p, old channel exists: ~p", [UUID, OldChannelPid]),
+            {keep_state, State, [{reply, From, {error, <<"channel existed">>}}]}
     end;
-%% 已经绑定了channel
-handle_event({call, From}, {attach_channel, _}, _, State = #state{uuid = UUID, channel_pid = OldChannelPid}) ->
-    logger:notice("[iot_host] attach_channel host_id uuid: ~p, old channel exists: ~p", [UUID, OldChannelPid]),
-    {keep_state, State, [{reply, From, {error, <<"channel existed">>}}]};
 
 %% 数据分发
 handle_event(cast, {handle, {data, RouteKey, MetricBin}}, ?STATE_ACTIVATED,
diff --git a/src/transport/tcp/ssl_channel.erl b/src/transport/tcp/ssl_channel.erl
index a0f975d..6c7a731 100644
--- a/src/transport/tcp/ssl_channel.erl
+++ b/src/transport/tcp/ssl_channel.erl
@@ -55,10 +55,10 @@ command(Pid, Command) when is_pid(Pid) ->
 -spec activate(Pid :: pid(), Auth :: boolean()) -> no_return().
 activate(Pid, Auth) when is_pid(Pid), is_boolean(Auth) ->
     Cmd = case Auth of true -> 'ACTIVATE'; false -> 'DEACTIVATE' end,
-    Command =  #'CastFrame.Command'{
+    Command = #'CastFrame.Command'{
         command = {auth, #'CastFrame.Command.Authorization'{cmd = Cmd}}
     },
-    command(Pid, Command).
+    gen_server:cast(Pid, {command, Command}).
 
 -spec container_call(Pid :: pid(), ReceiverPid :: pid(), Request :: message_pb:'ContainerRequest'()) -> Ref :: reference().
 container_call(Pid, ReceiverPid, Request) when is_pid(Pid), is_pid(ReceiverPid), is_record(Request, 'ContainerRequest') ->
@@ -114,7 +114,7 @@ handle_cast({pub, Topic, Qos, Content}, State = #state{transport = Transport, so
 %% 发送Command消息
 handle_cast({command, Command}, State = #state{transport = Transport, socket = Socket}) ->
     Encoded = message_pb:encode_msg(#'CastFrame'{
-        body = Command
+        body = {command, Command}
     }),
     Transport:send(Socket, <<?FRAME_CAST, Encoded/binary>>),
     {noreply, State};